linux_ipc.c revision 1.45
1 /* $NetBSD: linux_ipc.c,v 1.45 2008/04/15 11:08:05 njoly Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_ipc.c,v 1.45 2008/04/15 11:08:05 njoly Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_sysv.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/shm.h> 48 #include <sys/sem.h> 49 #include <sys/msg.h> 50 #include <sys/proc.h> 51 #include <sys/systm.h> 52 #include <sys/vnode.h> 53 54 #include <sys/mount.h> 55 #include <sys/syscallargs.h> 56 57 #include <compat/linux/common/linux_types.h> 58 #include <compat/linux/common/linux_signal.h> 59 #include <compat/linux/common/linux_util.h> 60 #include <compat/linux/common/linux_ipc.h> 61 #include <compat/linux/common/linux_msg.h> 62 #include <compat/linux/common/linux_shm.h> 63 #include <compat/linux/common/linux_sem.h> 64 65 #include <compat/linux/linux_syscallargs.h> 66 #include <compat/linux/linux_syscall.h> 67 68 #include <compat/linux/common/linux_ipccall.h> 69 #include <compat/linux/common/linux_machdep.h> 70 71 /* 72 * Note: Not all linux architechtures have explicit versions 73 * of the SYSV* syscalls. On the ones that don't 74 * we pretend that they are defined anyway. *_args and 75 * prototypes are defined in individual headers; 76 * syscalls.master lists those syscalls as NOARGS. 77 * 78 * The functions in multiarch are the ones that just need 79 * the arguments shuffled around and then use the 80 * normal NetBSD syscall. 81 * 82 * Function in multiarch: 83 * linux_sys_ipc : linux_ipccall.c 84 * liunx_semop : linux_ipccall.c 85 * linux_semget : linux_ipccall.c 86 * linux_msgsnd : linux_ipccall.c 87 * linux_msgrcv : linux_ipccall.c 88 * linux_msgget : linux_ipccall.c 89 * linux_shmdt : linux_ipccall.c 90 * linux_shmget : linux_ipccall.c 91 */ 92 93 #if defined (SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) 94 /* 95 * Convert between Linux and NetBSD ipc_perm structures. Only the 96 * order of the fields is different. 97 */ 98 void 99 linux_to_bsd_ipc_perm(struct linux_ipc_perm *lpp, struct ipc_perm *bpp) 100 { 101 102 bpp->_key = lpp->l_key; 103 bpp->uid = lpp->l_uid; 104 bpp->gid = lpp->l_gid; 105 bpp->cuid = lpp->l_cuid; 106 bpp->cgid = lpp->l_cgid; 107 bpp->mode = lpp->l_mode; 108 bpp->_seq = lpp->l_seq; 109 } 110 111 void 112 linux_to_bsd_ipc64_perm(struct linux_ipc64_perm *lpp, struct ipc_perm *bpp) 113 { 114 bpp->_key = lpp->l_key; 115 bpp->uid = lpp->l_uid; 116 bpp->gid = lpp->l_gid; 117 bpp->cuid = lpp->l_cuid; 118 bpp->cgid = lpp->l_cgid; 119 bpp->mode = lpp->l_mode; 120 bpp->_seq = lpp->l_seq; 121 } 122 123 void 124 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct linux_ipc_perm *lpp) 125 { 126 127 lpp->l_key = bpp->_key; 128 lpp->l_uid = bpp->uid; 129 lpp->l_gid = bpp->gid; 130 lpp->l_cuid = bpp->cuid; 131 lpp->l_cgid = bpp->cgid; 132 lpp->l_mode = bpp->mode; 133 lpp->l_seq = bpp->_seq; 134 } 135 136 void 137 bsd_to_linux_ipc64_perm(struct ipc_perm *bpp, struct linux_ipc64_perm *lpp) 138 { 139 lpp->l_key = bpp->_key; 140 lpp->l_uid = bpp->uid; 141 lpp->l_gid = bpp->gid; 142 lpp->l_cuid = bpp->cuid; 143 lpp->l_cgid = bpp->cgid; 144 lpp->l_mode = bpp->mode; 145 lpp->l_seq = bpp->_seq; 146 } 147 148 #endif 149 150 #ifdef SYSVSEM 151 /* 152 * Semaphore operations. Most constants and structures are the same on 153 * both systems. Only semctl() needs some extra work. 154 */ 155 156 /* 157 * Convert between Linux and NetBSD semid_ds structures. 158 */ 159 void 160 bsd_to_linux_semid_ds(struct semid_ds *bs, struct linux_semid_ds *ls) 161 { 162 163 bsd_to_linux_ipc_perm(&bs->sem_perm, &ls->l_sem_perm); 164 ls->l_sem_otime = bs->sem_otime; 165 ls->l_sem_ctime = bs->sem_ctime; 166 ls->l_sem_nsems = bs->sem_nsems; 167 ls->l_sem_base = bs->_sem_base; 168 } 169 170 void 171 linux_to_bsd_semid_ds(struct linux_semid_ds *ls, struct semid_ds *bs) 172 { 173 174 linux_to_bsd_ipc_perm(&ls->l_sem_perm, &bs->sem_perm); 175 bs->sem_otime = ls->l_sem_otime; 176 bs->sem_ctime = ls->l_sem_ctime; 177 bs->sem_nsems = ls->l_sem_nsems; 178 bs->_sem_base = ls->l_sem_base; 179 } 180 181 /* 182 * Most of this can be handled by directly passing the arguments on; we 183 * just need to frob the `cmd' and convert the semid_ds and semun. 184 */ 185 int 186 linux_sys_semctl(struct lwp *l, const struct linux_sys_semctl_args *uap, register_t *retval) 187 { 188 /* { 189 syscallarg(int) semid; 190 syscallarg(int) semnum; 191 syscallarg(int) cmd; 192 syscallarg(union linux_semun) arg; 193 } */ 194 struct semid_ds sembuf; 195 struct linux_semid_ds lsembuf; 196 union __semun semun; 197 int cmd, error; 198 void *pass_arg = NULL; 199 200 cmd = SCARG(uap, cmd); 201 202 switch (cmd) { 203 case LINUX_IPC_SET: 204 pass_arg = &sembuf; 205 cmd = IPC_SET; 206 break; 207 208 case LINUX_IPC_STAT: 209 pass_arg = &sembuf; 210 cmd = IPC_STAT; 211 break; 212 213 case LINUX_IPC_RMID: 214 cmd = IPC_RMID; 215 break; 216 217 case LINUX_GETVAL: 218 cmd = GETVAL; 219 break; 220 221 case LINUX_GETPID: 222 cmd = GETPID; 223 break; 224 225 case LINUX_GETNCNT: 226 cmd = GETNCNT; 227 break; 228 229 case LINUX_GETZCNT: 230 cmd = GETZCNT; 231 break; 232 233 case LINUX_GETALL: 234 pass_arg = &semun; 235 semun.array = SCARG(uap, arg).l_array; 236 cmd = GETALL; 237 break; 238 239 case LINUX_SETVAL: 240 pass_arg = &semun; 241 semun.val = SCARG(uap, arg).l_val; 242 cmd = SETVAL; 243 break; 244 245 case LINUX_SETALL: 246 pass_arg = &semun; 247 semun.array = SCARG(uap, arg).l_array; 248 cmd = SETALL; 249 break; 250 251 default: 252 return (EINVAL); 253 } 254 255 if (cmd == IPC_SET) { 256 error = copyin(SCARG(uap, arg).l_buf, &lsembuf, 257 sizeof(lsembuf)); 258 if (error) 259 return (error); 260 linux_to_bsd_semid_ds(&lsembuf, &sembuf); 261 } 262 263 error = semctl1(l, SCARG(uap, semid), SCARG(uap, semnum), cmd, 264 pass_arg, retval); 265 266 if (error == 0 && cmd == IPC_STAT) { 267 bsd_to_linux_semid_ds(&sembuf, &lsembuf); 268 error = copyout(&lsembuf, SCARG(uap, arg).l_buf, 269 sizeof(lsembuf)); 270 } 271 272 return (error); 273 } 274 #endif /* SYSVSEM */ 275 276 #ifdef SYSVMSG 277 278 void 279 linux_to_bsd_msqid_ds(struct linux_msqid_ds *lmp, struct msqid_ds *bmp) 280 { 281 282 linux_to_bsd_ipc_perm(&lmp->l_msg_perm, &bmp->msg_perm); 283 bmp->_msg_first = lmp->l_msg_first; 284 bmp->_msg_last = lmp->l_msg_last; 285 bmp->_msg_cbytes = lmp->l_msg_cbytes; 286 bmp->msg_qnum = lmp->l_msg_qnum; 287 bmp->msg_qbytes = lmp->l_msg_qbytes; 288 bmp->msg_lspid = lmp->l_msg_lspid; 289 bmp->msg_lrpid = lmp->l_msg_lrpid; 290 bmp->msg_stime = lmp->l_msg_stime; 291 bmp->msg_rtime = lmp->l_msg_rtime; 292 bmp->msg_ctime = lmp->l_msg_ctime; 293 } 294 295 void 296 bsd_to_linux_msqid_ds(struct msqid_ds *bmp, struct linux_msqid_ds *lmp) 297 { 298 299 bsd_to_linux_ipc_perm(&bmp->msg_perm, &lmp->l_msg_perm); 300 lmp->l_msg_first = bmp->_msg_first; 301 lmp->l_msg_last = bmp->_msg_last; 302 lmp->l_msg_cbytes = bmp->_msg_cbytes; 303 lmp->l_msg_qnum = bmp->msg_qnum; 304 lmp->l_msg_qbytes = bmp->msg_qbytes; 305 lmp->l_msg_lspid = bmp->msg_lspid; 306 lmp->l_msg_lrpid = bmp->msg_lrpid; 307 lmp->l_msg_stime = bmp->msg_stime; 308 lmp->l_msg_rtime = bmp->msg_rtime; 309 lmp->l_msg_ctime = bmp->msg_ctime; 310 } 311 312 int 313 linux_sys_msgctl(struct lwp *l, const struct linux_sys_msgctl_args *uap, register_t *retval) 314 { 315 /* { 316 syscallarg(int) msqid; 317 syscallarg(int) cmd; 318 syscallarg(struct linux_msqid_ds *) buf; 319 } */ 320 struct msqid_ds bm; 321 struct linux_msqid_ds lm; 322 int error; 323 324 switch (SCARG(uap, cmd)) { 325 case LINUX_IPC_STAT: 326 error = msgctl1(l, SCARG(uap, msqid), IPC_STAT, &bm); 327 if (error == 0) { 328 bsd_to_linux_msqid_ds(&bm, &lm); 329 error = copyout(&lm, SCARG(uap, buf), sizeof lm); 330 } 331 return error; 332 case LINUX_IPC_SET: 333 if ((error = copyin(SCARG(uap, buf), &lm, sizeof lm))) 334 return error; 335 linux_to_bsd_msqid_ds(&lm, &bm); 336 return msgctl1(l, SCARG(uap, msqid), IPC_SET, &bm); 337 case LINUX_IPC_RMID: 338 return msgctl1(l, SCARG(uap, msqid), IPC_RMID, NULL); 339 break; 340 default: 341 return EINVAL; 342 } 343 } 344 #endif /* SYSVMSG */ 345 346 #ifdef SYSVSHM 347 /* 348 * shmget(2). Just make sure the Linux-compatible shmat() semantics 349 * is enabled for the segment, so that shmat() succeeds even when 350 * the segment would be removed. 351 */ 352 int 353 linux_sys_shmget(struct lwp *l, const struct linux_sys_shmget_args *uap, register_t *retval) 354 { 355 /* { 356 syscallarg(key_t) key; 357 syscallarg(size_t) size; 358 syscallarg(int) shmflg; 359 } */ 360 struct sys_shmget_args bsd_ua; 361 362 SCARG(&bsd_ua, key) = SCARG(uap, key); 363 SCARG(&bsd_ua, size) = SCARG(uap, size); 364 SCARG(&bsd_ua, shmflg) = SCARG(uap, shmflg) | _SHM_RMLINGER; 365 366 return sys_shmget(l, &bsd_ua, retval); 367 } 368 369 /* 370 * shmat(2). Very straightforward, except that Linux passes a pointer 371 * in which the return value is to be passed. This is subsequently 372 * handled by libc, apparently. 373 */ 374 #ifndef __amd64__ 375 int 376 linux_sys_shmat(struct lwp *l, const struct linux_sys_shmat_args *uap, register_t *retval) 377 { 378 /* { 379 syscallarg(int) shmid; 380 syscallarg(void *) shmaddr; 381 syscallarg(int) shmflg; 382 syscallarg(u_long *) raddr; 383 } */ 384 int error; 385 386 if ((error = sys_shmat(l, (const void *)uap, retval))) 387 return error; 388 389 if ((error = copyout(&retval[0], SCARG(uap, raddr), sizeof retval[0]))) 390 return error; 391 392 retval[0] = 0; 393 return 0; 394 } 395 #endif /* __amd64__ */ 396 397 /* 398 * Convert between Linux and NetBSD shmid_ds structures. 399 * The order of the fields is once again the difference, and 400 * we also need a place to store the internal data pointer 401 * in, which is unfortunately stored in this structure. 402 * 403 * We abuse a Linux internal field for that. 404 */ 405 void 406 linux_to_bsd_shmid_ds(struct linux_shmid_ds *lsp, struct shmid_ds *bsp) 407 { 408 409 linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm); 410 bsp->shm_segsz = lsp->l_shm_segsz; 411 bsp->shm_lpid = lsp->l_shm_lpid; 412 bsp->shm_cpid = lsp->l_shm_cpid; 413 bsp->shm_nattch = lsp->l_shm_nattch; 414 bsp->shm_atime = lsp->l_shm_atime; 415 bsp->shm_dtime = lsp->l_shm_dtime; 416 bsp->shm_ctime = lsp->l_shm_ctime; 417 bsp->_shm_internal = lsp->l_private2; /* XXX Oh well. */ 418 } 419 420 void 421 linux_to_bsd_shmid64_ds(struct linux_shmid64_ds *lsp, struct shmid_ds *bsp) 422 { 423 424 linux_to_bsd_ipc64_perm(&lsp->l_shm_perm, &bsp->shm_perm); 425 bsp->shm_segsz = lsp->l_shm_segsz; 426 bsp->shm_lpid = lsp->l_shm_lpid; 427 bsp->shm_cpid = lsp->l_shm_cpid; 428 bsp->shm_nattch = lsp->l_shm_nattch; 429 bsp->shm_atime = lsp->l_shm_atime; 430 bsp->shm_dtime = lsp->l_shm_dtime; 431 bsp->shm_ctime = lsp->l_shm_ctime; 432 bsp->_shm_internal = (void*)lsp->l___unused5; /* XXX Oh well. */ 433 } 434 435 void 436 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct linux_shmid_ds *lsp) 437 { 438 439 bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm); 440 lsp->l_shm_segsz = bsp->shm_segsz; 441 lsp->l_shm_lpid = bsp->shm_lpid; 442 lsp->l_shm_cpid = bsp->shm_cpid; 443 lsp->l_shm_nattch = bsp->shm_nattch; 444 lsp->l_shm_atime = bsp->shm_atime; 445 lsp->l_shm_dtime = bsp->shm_dtime; 446 lsp->l_shm_ctime = bsp->shm_ctime; 447 lsp->l_private2 = bsp->_shm_internal; /* XXX */ 448 } 449 450 void 451 bsd_to_linux_shmid64_ds(struct shmid_ds *bsp, struct linux_shmid64_ds *lsp) 452 { 453 bsd_to_linux_ipc64_perm(&bsp->shm_perm, &lsp->l_shm_perm); 454 lsp->l_shm_segsz = bsp->shm_segsz; 455 lsp->l_shm_lpid = bsp->shm_lpid; 456 lsp->l_shm_cpid = bsp->shm_cpid; 457 lsp->l_shm_nattch = bsp->shm_nattch; 458 lsp->l_shm_atime = bsp->shm_atime; 459 lsp->l_shm_dtime = bsp->shm_dtime; 460 lsp->l_shm_ctime = bsp->shm_ctime; 461 lsp->l___unused5 = (u_long)bsp->_shm_internal; /* XXX */ 462 } 463 464 /* 465 * shmctl.SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented 466 * by NetBSD itself. 467 * 468 * The usual structure conversion and massaging is done. 469 */ 470 int 471 linux_sys_shmctl(struct lwp *l, const struct linux_sys_shmctl_args *uap, register_t *retval) 472 { 473 /* { 474 syscallarg(int) shmid; 475 syscallarg(int) cmd; 476 syscallarg(struct linux_shmid_ds *) buf; 477 } */ 478 struct shmid_ds bs; 479 struct linux_shmid_ds ls; 480 struct linux_shmid64_ds ls64; 481 struct linux_shminfo64 lsi64; 482 struct linux_shm_info lsi; 483 int error, i, cmd, shmid; 484 485 shmid = SCARG(uap, shmid); 486 cmd = SCARG(uap, cmd); 487 #ifdef LINUX_SHMCTL_FORCEIPC64 488 if (cmd == LINUX_IPC_STAT || cmd == LINUX_SHM_STAT) 489 cmd |= LINUX_IPC_64; 490 #endif 491 492 switch (cmd) { 493 case LINUX_IPC_STAT: 494 case LINUX_SHM_STAT: 495 if (cmd == LINUX_SHM_STAT) { 496 shmid = IXSEQ_TO_IPCID(shmid, shmsegs[shmid].shm_perm); 497 retval[0] = shmid; 498 } 499 error = shmctl1(l, shmid, IPC_STAT, &bs); 500 if (error != 0) 501 return error; 502 bsd_to_linux_shmid_ds(&bs, &ls); 503 return copyout(&ls, SCARG(uap, buf), sizeof ls); 504 505 case LINUX_IPC_STAT | LINUX_IPC_64: 506 case LINUX_SHM_STAT | LINUX_IPC_64: 507 if (cmd == (LINUX_SHM_STAT | LINUX_IPC_64)) { 508 shmid = IXSEQ_TO_IPCID(shmid, shmsegs[shmid].shm_perm); 509 retval[0] = shmid; 510 } 511 error = shmctl1(l, shmid, IPC_STAT, &bs); 512 if (error != 0) 513 return error; 514 bsd_to_linux_shmid64_ds(&bs, &ls64); 515 return copyout(&ls64, SCARG(uap, buf), sizeof ls64); 516 517 case LINUX_IPC_SET: 518 if ((error = copyin(SCARG(uap, buf), &ls, sizeof ls))) 519 return error; 520 linux_to_bsd_shmid_ds(&ls, &bs); 521 return shmctl1(l, shmid, IPC_SET, &bs); 522 523 case LINUX_IPC_RMID: 524 return shmctl1(l, shmid, IPC_RMID, NULL); 525 526 case LINUX_SHM_LOCK: 527 return shmctl1(l, shmid, SHM_LOCK, NULL); 528 529 case LINUX_SHM_UNLOCK: 530 return shmctl1(l, shmid, SHM_UNLOCK, NULL); 531 532 case LINUX_IPC_INFO: 533 memset(&lsi64, 0, sizeof lsi64); 534 lsi64.l_shmmax = shminfo.shmmax; 535 lsi64.l_shmmin = shminfo.shmmin; 536 lsi64.l_shmmni = shminfo.shmmni; 537 lsi64.l_shmseg = shminfo.shmseg; 538 lsi64.l_shmall = shminfo.shmall; 539 for (i = shminfo.shmmni - 1; i > 0; i--) 540 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 541 break; 542 retval[0] = i; 543 return copyout(&lsi64, SCARG(uap, buf), sizeof lsi64); 544 545 case LINUX_SHM_INFO: 546 (void)memset(&lsi, 0, sizeof lsi); 547 lsi.l_used_ids = shm_nused; 548 for (i = 0; i < shminfo.shmmni; i++) 549 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 550 lsi.l_shm_tot += 551 round_page(shmsegs[i].shm_segsz) / 552 uvmexp.pagesize; 553 lsi.l_shm_rss = 0; 554 lsi.l_shm_swp = 0; 555 lsi.l_swap_attempts = 0; 556 lsi.l_swap_successes = 0; 557 for (i = shminfo.shmmni - 1; i > 0; i--) 558 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 559 break; 560 retval[0] = i; 561 return copyout(&lsi, SCARG(uap, buf), sizeof lsi); 562 563 default: 564 #ifdef DEBUG 565 printf("linux_sys_shmctl cmd %d\n", SCARG(uap, cmd)); 566 #endif 567 return EINVAL; 568 } 569 } 570 #endif /* SYSVSHM */ 571
Indexes created Tue Sep 23 14:10:03 GMT 2025